This research aims to know the effect of using virtual laboratorial towards concept mastery and creative thinking ability of students on the material of vibrations and waves. This research is an experimental research that uses pretest-postest control group design. The population of this research is all grade VIII students of SMPN 1 Alas Barat in the academic year 2013/2014 and the sample of this research is grade VIII3 as experimental group and VIII4 as control group that determined by cluster random sampling technique. The instrument thet used to collect the data is test that made in terms of multiple choices and essay test. The data is analysed by statistical formula of N-Gain and t-test. The result of N-Gain of experimental group concepts mastery is 0,5% and control group is 0,2%. Meanwhile, the result of N-Gain of experimental group creative thinking ability is 0,3% and control group is 0,1%. The resultof t-test shows that tobtined of concepts mastery is 1,877 ≥ ttable is 1,671. Whereas, for creative thinking ability shows that tobtined is 1,998 ≥ ttable is 1,671. It means that there is a difference of concept mastery and creative thinking ability of students on the material of vibrations and waves. Therefore, it can be concluded that the use of virtual laboratorial has an effect towards concept mastery and creative thinking ability of students on the material of vibrations and waves.

This research aimed to figure out the effect of discovery learning using PhET to the learning outcome in physics of the second-grade students in SMAN 1 Kediri Academic Year 2017/2018. This research was conducted as the result of experiment using non-equivalent control group design. The population of this research was the whole second-grade students in SMAN 1 Kediri. To limit the sample, surfeited sampling was applied consisting the students in class XI MS I as the experiment class and class MS II as the control class. Research instrument used was the multiple-choice test after the tests of validity, reliability, discrimination power, and difficulty level have been done. The increasing of the learning outcome was defined from the result of N-gain test per sub-chapter. The result of this research showed that the learning outcome of the students has increased to both classes. This proved that discovery learning method using PhET has succeeded in increasing the students’ learning outcome for Physics.

Learning physics is not only produces a good learning outcomes, but requires the understanding, reasoning ability and conceptual understanding to solve the problems. Efforts that can be done to design a good learning is to mapping the ability of the learners. In this research, mapping of preservice physics teacher’s reasoning ability profile to know the description of the ability of spatial reasoning, logical reasoning and analytical reasoning. This is descriptive research. The population of this study includes all of students of physics education at Mataram University with the number of respondents as many as 125 students from the proportionally selected from each grade. The result of simple descriptive statistic test shows that students have higher spatial reasoning ability compared to logical and analytical reasoning ability as indicated by average score of reasoning ability test. Spatial reasoning skills of prospective teachers’ are also analyzed on the basis of their indicators. The highest scores is on the ability to complete the pattern and the lowest score is on the relation and logical consistency.

The ozone generator with Dielectric Barrier Discharge Plasma Technology (DBDPT) with Spiral-cylinder configuration has been developed. DBDP Reactor was constructed with spiral wire and cylinder. Plasma condition has been generated by using AC high voltage Ozone has been produced by this technology with oxygen and dry air as sources for ozone generating. In this research we found that the concentration of ozone produced increases with increasing voltage with a time constant. This concentration also increases with increasing time in certain applied voltage. Ozone concentration was higher than the concentration of dissolved ozone in water. Dissolved ozone in water was only 10 % of ozone produced and only 7 % for dry air as source. Oxygen as source of ozone was better than dry air; both for ozone produced and dissolved ozone in water. Keyword : Ozone, Spiral-cylinder, DBDP, Oxygen, Dry air

ABSTRACT---Uptake of nickel(II) ions from solution are studied using strong base anion resin ( Lewatit M500, counter ions of Cl-) and dimethylglyoxime (2,3-butanedione dioxime, H2DMG) as chelating agent. This study was conducted to determine optimum condition of chelate resin preparation for uptake of nickel(II) ions from solution. The research used batch and column techniques. Batch technique was used to determine the best contact time at chelate resin preparation, capacity of chelate resin ( mg Ni2+/ g), effect of pH stripping (pH 1- 5) and pH of nickel(II) solution (pH 4 - 10) to capacity of chelate resin as well as effect of pH backwash (pH 1- 5) to percentage of nickel(II) ions recovery. Column technique was used for uptake of nickel(II) ions from waste water of industrial of metal veneering. Column flow rate was kept constant at 2 mL/ minute. Nickel(II) ions which were not removed by chelate resin was quantitatively analyzed with atomic absorption spectrophotometer at wavelength of 232,00 nm. Result of the research revealed the best contact time at chelate resin preparation was 120 - 240 minutes for variation of contact time from 0 to 240 minutes to each 25 gram strong base anion resin. Capacity of chelate resin was obtained about 0,209 to 0,214 mg Ni2+/ g chelate resin. Capacity of chelate resin decreased progressively after process of stripping that was 0,217 - 0 mg Ni2+/ g from pH of 5 to 1. The best range pH of nickel(II) solution was obtained at pH of 6 to 7 with capacity of chelate resin from 0,239 to 0,241 mg Ni2+/ g and selected at pH 6. Percentage recovery of nickel(II) ions increased 21,966 to 75,314% from pH backwash of 5 to 1. With column technique, chelate resin capacity was obtained 0,208 mg Ni2+/ g and breakthrough point was reached when flow times reached in 60 to 80 minutes.Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/2854